Investigation of tendency to long-term change in groundwater flow based on distribution of fluvial terrace

Nohara, Tsuyoshi   ; Tajikara, Masayoshi; Yasue, Kenichi; Kusano, Tomohiro

This research aims at the reliability improvement of the investigation and the evaluation technique of the underground water flow related to long-term stability. The tendency to a long-term change in the underground water flow is presumed from the fluvial terrace distribution of the Tono area. It is recognized that underground water rise in the discharge area as a result of the analysis of the disequilibrium data during the past several thousand years.